Speaker



FIG. 1 is a reduced top front perspective view of a speaker, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof, the left side being a mirror image;

FIG. 4 is a top plan view thereof, the bottom being a mirror image; and,

FIG. 5 is a rear elevational view thereof. 

The ornamental design for a speaker, as shown and described. 